Table 69 Boot Block Recovery Code Checkpoints; Table 70. Runtime Code Uncompressed In F000 Shadow Ram - Intel S875WP1LX Specification

Error Reporting and Handling

Table 69 Boot Block Recovery Code Checkpoints

Code
E0 Onboard Floppy Controller (if any) is initialized. Compressed recovery code is uncompressed in F000:0000
in Shadow RAM and give control to recovery code in F000 Shadow RAM. Initialize interrupt vector tables,
initialize system timer, initialize DMA controller and interrupt controller.
E8 Initialize extra (Intel Recovery) Module.
E9 Initialize floppy drive.
EA Try to boot from floppy. If reading of boot sector is successful, give control to boot sector code.
EB Booting from floppy failed, look for ATAPI (LS-120, Zip) devices.
EC Try to boot from ATAPI. If reading of boot sector is successful, give control to boot sector code.
EF Booting from floppy and ATAPI device failed. Give two beeps. Retry the booting procedure again (go to
check point E9).

Table 70. Runtime Code Uncompressed in F000 Shadow RAM

Code
03 NMI is Disabled. To check soft reset/power-on.
05 BIOS stack set. Going to disable cache if any.
06 POST code to be uncompressed.
07 CPU init and CPU data area init to be done.
08 CMOS checksum calculation to be done next.
0B Any initialization before keyboard BAT to be done next.
0C KB controller I/B free. To issue the BAT command to keyboard controller.
0E Any initialization after KB controller BAT to be done next.
0F Keyboard command byte to be written.
10 Going to issue Pin-23,24 blocking/unblocking command.
11 Going to check pressing of <INS>, <END> key during power-on.
12 To init CMOS if "Init CMOS in every boot" is set or <END> key is pressed. Going to disable DMA and
Interrupt controllers.
13 Video display is disabled and port-B is initialized. Chipset init about to begin.
14 8254 timer test about to start.
19 About to start memory refresh test.
1A Memory Refresh line is toggling. Going to check 15 µs ON/OFF time.
23 To read 8042 input port and disable Megakey GreenPC feature. Make BIOS code segment writeable.
24 To do any setup before Int vector init.
25 Interrupt vector initialization to begin. To clear password if necessary.
27 Any initialization before setting video mode to be done.
28 Going for monochrome mode and color mode setting.
2A Different buses init (system, static, output devices) to start if present.
2B To give control for any setup required before optional video ROM check.
2C To look for optional video ROM and give control.
2D To give control to do any processing after video ROM returns control.
2E If EGA/VGA not found then do display memory R/W test.
90
Description of POST Operation
Description of POST Operation
S875WP1-E TPS
Revision 4.0